A solution contains 30 ppm of benzene. The density of the solution is 1.00 g/mL. This means that ________.
A)there are 30 mg of benzene in 1.0 L of this solution
B)100 g of the solution contains 30 g of benzene
C)100 g of the solution contains 30 mg of benzene
D)the solution is 30% by mass of benzene
E)the molarity of the solution is 30 M

Question

Quizplus · Accepted Answer

ppm (parts per million) is a unit of concentration, which means that out of 1 million parts, 30 parts are benzene. This can also be written as 30 mg/L (or 30 mg/1000 mL). Since the density of the solution is given as 1.00 g/mL, 1 L of the solution would have a mass of 1000 g. Therefore, there would be 30 mg of benzene in 1 L of the solution, which corresponds to choice A.

A Solution Contains 30 Ppm of Benzene